Only supported file types are shown in the Roku Media Player channel. The channel hides unsupported file types. Dolby Digital audio in MKV and MP4 movies is only supported via pass through.

DTS in MKV movies is also only supported via pass through. You must connect your Roku player via HDMI to a TV or receiver capable of decoding Dolby Digital or DTS in order to hear videos with audio tracks in those formats.